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Q. A new car is tested on a 250 diameter track. If the car speeds up at a steady 1.7m/s^2 , how long after starting is the magnitude of its centripetal acceleration equal to the tangential acceleration?
Q. Old naval ships fired 11 kg cannon balls from a 250 kg cannon. It was very important to stop the recoil of the cannon, since otherwise the heavy cannon would go careening across the deck of the ship. In one design, a large spring with spring constant 2.0×10^4 N/m was placed behind the cannon. The other end of the spring braced against a post that was firmly anchored to the ship's frame.
The specific heat of ice to is 2100 and the heat of fusion for ice is . How much time passes before ice starts to melt? From the time while the heating begins, how much time does it take before the temperature begins to rise above 0.
A 1300 N uniform boom is supported by a cable perpendicular to boom. The boom is hinged at the bottom, and a 2100N weight hangs from its top.
What is height of the cliff
A woman is reported to have fallen 139 ft from a building, landing on a metal ventilator box, which she crushed to a depth of 30 in. She suffered only minor injuries.
A dolphin located in seawater at a temperature of 25 °C emits a sound directed toward the bottom of the ocean 200m below. How much time passes before it hears an echo.
A 15.00 block is attached to a very light horizontal spring of force constant 450 and is resting on a smooth horizontal table. Suddenly it is struck by a 3 stone travelling horizontally at 8 to the right, whereupon the stone rebounds at 2.00 horizont..
A pipe with a 2m diameter carries water having a velocity of 4 m/s. What is the mass flow rate of the water in kg/s at the following temperatures.
Two lightweight rods 24 {rm cm} in length are mounted perpendicular to an axle and at 180 ^circ to each other. At the end of each rod is a 480 {rm g} mass. The rods are spaced 42 {rm cm} apart along an axle. The axle rotates at 4.90 rad/s.
The mass of a roller-coaster car, including its passengers, is 495kg. Its speed at the bottom of the track in the figure below is 17.00 m/s. The radius of this section of track is r1 = 26 m. Find the force that a seat in the roller-coaster car exerts..
Find out an angular momentum of the system
How numerous atoms does each hand contain
Find out the coefficient of static friction
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